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结合现有的实际滑坡场地,开展了关中盆地黄土塬边的高边坡稳定性研究。基于弹塑性理论和非关联流动法则,根据双剪统一强度理论,建立了双剪统一弹塑性本构模型的显式有限差分格式。针对陕西省泾阳县南塬高边坡滑坡的现场勘测和室内试验,分析了滑坡的规模和滑坡前后的地形特征。在此基础上,还原了滑坡前的边坡地形概状,建立三维计算模型并运用三维拉格朗日有限差分方法分析了中间主应力对高边坡稳定性的影响;然后考虑中间主应力的影响对不同地下水埋深和渗流时边坡的稳定性进行分析。结果表明,考虑中间主应力情况下,随着地下水位升高,坡顶水平向位移增大;当不考虑渗流时,坡顶水平位移增大到一定值后边坡达到稳定状态,而考虑渗流时坡顶水平位移持续增大,并且容易发生突然的破坏失稳。期望对泾阳南塬滑坡群的破坏机制研究提供一定参考。
Combined with the existing actual landslide sites, the stability of the high slope on the loess plateau in the Guanzhong Basin was studied. Based on the elasto-plastic theory and the non-associated flow law, an explicit finite-difference scheme for a two-shear unified elastic-plastic constitutive model is established according to the double shear unified strength theory. Aiming at the scene investigation and laboratory test of high side slope of south plateau in Jingyang County, Shaanxi Province, the scale of landslide and the topographic features before and after the landslide are analyzed. On this basis, the slope topography of the landslide is restored, the three-dimensional calculation model is established, and the influence of the middle principal stress on the stability of the high slope is analyzed by using the three-dimensional Lagrange finite difference method. Then, considering the middle principal stress Affects the stability of slopes under different groundwater depths and seepage. The results show that with the increase of groundwater level, the horizontal displacement of slope top increases with the increase of groundwater level. When the horizontal displacement of slope top increases to a certain value without considering seepage, the slope reaches a steady state. The horizontal displacement of the top of the slope continues to increase, and sudden destructive instability is prone to occur. It is expected to provide some reference for the research on the failure mechanism of the landslide in the south of Jingyang.